package com.lsj.javashop.product.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.lsj.common.utils.PageUtils;
import com.lsj.common.utils.Query;
import com.lsj.javashop.product.dao.CategoryDao;
import com.lsj.javashop.product.entity.CategoryEntity;
import com.lsj.javashop.product.service.CategoryService;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

//    @Autowired
//    CategoryDao categoryDao;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1.查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);
        //2.组装成父子树形结构
            //2.1找到所有的一级分类
        List<CategoryEntity> level1Menus = entities.stream().filter(categoryEntity ->
                categoryEntity.getParentCid() == 0).map((menu)->{
                    menu.setChildren(getChildrens(menu,entities));  //getChildrens(menu,entities) 当前菜单的子菜单，entitis
                    return  menu;
        }).sorted((menu1,menu2)->{
            return(menu1.getSort() == null ? 0:menu1.getSort()) - (menu2.getSort()== null ? 0:menu2.getSort()); //排序
        }) .collect(Collectors.toList());


        return level1Menus;
    }

    //递归查找所有菜单的子菜单
    private  List<CategoryEntity> getChildrens(CategoryEntity root,List<CategoryEntity> all){  // root当前菜单  //all所有菜单
       List<CategoryEntity> children =  all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid()  == root.getCatId();
        }).map(categoryEntity -> {
            //1.找到子菜单
            categoryEntity.setChildren(getChildrens(categoryEntity,all));
            return  categoryEntity;
        }).sorted((menu1,menu2)->{
            //2.菜单的排序
            return (menu1.getSort() == null ? 0:menu1.getSort()) - (menu2.getSort()== null ? 0:menu2.getSort());
       }).collect(Collectors.toList());

        return children ;

    }

}
